Consignment fill-up - Output Printing Problem - Z customizing problem

Dear Gurus,

I have customized and copied the following 2 sales documents types:

- OR

- KB

into ZSTA and ZKB

When I create a Sales Order using VA01 and ZSTA, and chose 1 material + 1 service, the printed invoice clearly shows 2 items for each one of them.

When I create a Sales Order using VA01 and ZKB, and again chose 1 material + 1 service, only the material appears on the invoice and not the service...

Does anyone has an idea about where the problem might come from?

Your help is greatly appreciated.

Thank you

Chris.